Home / 20,351.89-28,087.32-11,399.23

Finding the Fourth Proportional to 20,351.89, 28,087.32 and 11,399.23

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Solution

The fourth proportional to 20,351.89, 28,087.32 and 11,399.23 is: 15,731.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,351.89 : 28,087.32 = 11,399.23 : x
  2. Step 2: Convert to fraction form
    20,351.89/28,087.32 = 11,399.23/x
  3. Step 3: Cross multiply
    20,351.89x = 28,087.32 × 11,399.23
  4. Step 4: Simplify right side
    20,351.89x = 320,173,820.76
  5. Step 5: Solve for x
    x = 320,173,820.76/20,351.89
  6. Step 6: Final answer
    x = 15,731.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.